I have an animation where I need a more detailed environment with distant signal lights (think airport runway at night). The camera moves fast and turns by almost 180° so there's some well noticeable motion blur in the background almost all of the time. In real life this would produce nice light streaks from the distant signal lights (from the motion blur and the intense light sources).
Most of the lights are pretty small, around 10-20 cm only, and that's where the sampling becomes inefficient. I need to crank up passes to unreasonably high levels in order to make the streaks look continuous. Render times are 10 times what I need them to be for an acceptable sampling level in the rest of the image, only to have the lights sampled better (though still not looking smooth). If the lights are around 1 m, they produce the effect I'm after and within reasonable pass numbers, but I just can't make them this big in our scene, it'll look completely wrong.
Sometimes, depending on the distance, even without any motion blur some of the lights won't show up, the sampling just keeps missing them. This is unacceptable for an animation since I need them to show up in every frame, not every nth frame in a random manner.
Both Corona Lights and geometry with CoronaLightMtl show the same behavior, unfortunately.
Is there anything I can utilize to make the sampling more efficient, maybe using a different random sampler than the default '2 High-D + PRNG'?
